Joe Biden.
Aside from being part of the regular "but the Democrats were the real racists!" taunt (yes, guys, we know), there's rarely a reckoning with just how amazingly racist these people were. I don't care what party they were of (at the national level many of them eventually became Republicans, some became somewhat repentant and improved Democrats, and local and state politics is always a bit more complicated), but we spent years just yelling "but states' rights" instead of acknowledging their words (let alone deeds).
They were *really really really racist*. Racism was central to the whole political project. It wasn't hidden behind bullshit legal philosophy or minor policy differences, it was right out there in the front. I imagine some of it would shock even our new alt-right friends.
It's one thing to say a few kind words about Strom Thurmond at his funeral. I get that sort of thing. But there's no reason to exhume these monsters to highlight what a getalong guy you are. Or maybe there is?